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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dead1e3ecebd1d8c63c182e064ea652a7871dabcb0ffc2ddf0dfd4170375f1fd' 
  AND token = 'YK7plLhitl11LiVYDfzYMGrACoW7hJTFZhTCJe60T84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}