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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38ebd55db9898ba2256263047723beb276315fb6b7e78ea7cc1300fb24851e8' 
  AND token = 'X/TPcp0Ju8AjC2LEQzGCxoHPRButDV58CXgPWFZJH0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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