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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c807506935c751a84881bdd3ee70cf1146a16e7dda367f3cae4b3074cedcc140' 
  AND token = '2gMU1jgksS+32ImXnFrXJj92dwz2Jv6SxCmnTp1Mkgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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