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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7de433f7cd8ffab33830368906899a5ecb23e1e1f274a3faf1cd6906ac37de3' 
  AND token = 'QavvScGZkiLRvEYcaRR5BXl2Cds35hoOunwH/jvBzQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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