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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a503854d69ab2fde0f79617578f26298c07d9de017382cce5fd5bc8138e99b6d' 
  AND token = 'Z05QXKV2eZy01S/4h5a001Zl+KOESK+wOr94S/ygFBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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