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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f92bb078678bed727c3f538374c7de62bb8b771b2c92b1afeeaac95e4d13cf6' 
  AND token = '1uCZ3oo2vmp0Iuz5M7PoL15VNvzzTYRtz7OK2hq5h7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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