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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02aeac31f896a93c89af9f9bcaf358c95cf42a28cc7a914a171bb6d2459bdca2' 
  AND token = 't3eLzgSNaCnovxzKh06LRMgORaKRBkQB9I/k/gZtorg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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