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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da2f9d16a3eb5ce42c1d38bbc0ff17b514bc1963293553fbf8f1bce16d033d9' 
  AND token = 'Yel+OuRbSL/MquVSct9IpLGfualkvlCTKwwA6+8CITE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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