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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44187132c9410f7013bade0093dda5bd1b6b2bfc57eab8eb73f9b35ac10be7fb' 
  AND token = 'OZsrBDg+cgPzDsbt/Kf7SfS7T88CDY5W8/XmlpkdVEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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