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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906e3c6458480125bef55dca01ccc2d4f22a917f697a2092b3cb9527f67d331b' 
  AND token = 'VYbl0NYtHeNzkA7Byckr0ZySZvDRjZsc31FbSOjKRnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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