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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1102f118ee35ae81d9c86e23f62fb4111120fc6ea645646dd403fc1bda7bbc40' 
  AND token = 'C/VaaLISidhbDFQkkcH9gL2yiCeRtaROWKXzMq6yqMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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