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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ab176f0f083ef9f073dd388767e9f109468e4d0841569bbb5a9f2d53b3e47a' 
  AND token = 'l4f2c10uGdzmwsBKALOned0dCDVSmjhDeNAEvi9NFjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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