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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dd2f098e7df5c4b60b2456014c538366d5e1a7540064d77773c70bfb3e4c40' 
  AND token = 'YAovqM9AbrtvsHocbXtyWQ/XUZtXvtIv81+qfwDIQt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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