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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fb67c9942a02813e7ac45e69680f5f15a90c7ad8d5fce8f3d407793a708d07' 
  AND token = 'cMEso9Wdk/RdAg1RH7Q59R9t44iJ1sWx24irqjmh7DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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