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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80facbf3b4d47bd613ec3bc97f55512e8f6906f6e86c88f036569f37012ce82e' 
  AND token = 'Upuurhk8ienGqVgUqj0EOQ5Twd8Oh/2FRY8siySxT38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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