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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bba2c4e26fb6ebf09c1478e2c6a11414518ca8414a3b6cb828be0e25b4e7935' 
  AND token = 'MdjWGb40JuwE13DbVI8/XkCeS8VoAEoDrPZrNhtapj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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