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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b861783bcd995f64d7c5bcc9c9c3041f1f58d60deb0cfb7a54f0d1633673606b' 
  AND token = 'lHvhyrBfdLMiIGA4l5+2PBNhyvY9+1yPwpSZ6P769dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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