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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea444d27bf3e69f9be2003cc0072f83800989dd82c78d3d80fc02022f1eb63c8' 
  AND token = '1PQRXxiYAWW3YJpQrfLs+rPnubds/Lk8xytXGq4oxI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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