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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7836ed7e2da618d7382d60388eb95c1d8a5c5ca7a9e756d5b0758f287eb3e08c' 
  AND token = 'y/EtlEpiUd33AFiK7346zu195FzoNbAtwzWzXWCFFRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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