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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc12b27bd2d3f6df1ee29ffb691aa6abfd53c4835dcbb7df0233fe81981d4d6c' 
  AND token = 'bBE3tlgv8RrQGXeCGVphQ7tf6uerFDX7GdTll+3V8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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