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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc92a89d12ff7bbb8bdcfabc460cbbdd6cd889e5055cb6c70deae452a9073de' 
  AND token = 'Yq41vmhI/XJ7gyOZidPYdz1k6uJcRvVuJOLVrjMo9WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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