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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4668cf214b5d1f8d78cdfaa6ac7c22240582218edc360d5ef5ae024d30299649' 
  AND token = 'fiD5lcjiMofOmef9ogJ7gqJ1OEv3MCClALKDrKM2uuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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