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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f156cc8f8e746f1e8065e946c936c0caa4272a16381ee7fae8750d22be79a51' 
  AND token = '+suDQegO5Wp742SbnTCdt9PFhakZ51Jk7ojT6i7RzOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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