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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc30b748835ec2c2fe2ec9ed3776bf599d575c5e9811b8f6363954197e9bdc94' 
  AND token = 'yiVK80F53MySBXkVGSEZT6CA17LmAAoUwykjYr+SS+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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