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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3857b3de2d4dc26047087acb5c5b9a007d5eb714a1bc620fd6b4c6c53b21f6f' 
  AND token = 'Cx7bOzz2J846+tic/8CvUV3lswBnsKpZ0s2BzbA4VIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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