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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86bd8a6d801a12092d20d10ffd7e233daa96b7a337b0fa6c5475f159b4fabe0' 
  AND token = 'VllVp33eXlbTNESiugRIzWSDVAUh0f9voQJNbEj3THA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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