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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84aee159f945b54cb703510188231d65234e09399ff32da01c62f09aee735f5' 
  AND token = 'AICdBc1GbISXoQnH0+3RbKK15H8dYEsBuPkY62oMUQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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