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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79d1430280c0f49a39a24b54d8d0ada8b8c782c8c88138bf907832f4104a2e9' 
  AND token = 'VMdUA4DW1REA++SUlCk0QYfOITyLmNsIS93xSWXKKLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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