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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3f205a28b6944aea7cd1f07f5892423f719b9f78143119fb6fd1ada1e3d603' 
  AND token = 'kWr3bF9R4jNkQ+8nF8DCq68Zni1NmzBPk8C9eoDIiac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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