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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7802a7ea86821fe4dcf50ce45c5367c3cf7a68fac5abfbed9fa73c5e4b51d8af' 
  AND token = 'kzUCiyKWIbJ+SFsDNrUhfQ6aLY8RkUZPSBGJZKvTLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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