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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b57968d962a0df12091037fb2ba28433b33f1f61f3e433b963c9ac7ec9fae32' 
  AND token = 'XbIb7TzhWPZ30P4++XX/NozkskSvWdncr6LRWc+rqss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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