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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce832d4d0e3b59359b81009438c824d4458e150243e60126016b03e86c140f3' 
  AND token = 'IEzkzboye141e0HTNAVCGLcLwO3/L+emmzAKX/VL48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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