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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c2a2a48fbde4aac315b9348d9c3b23ea31735c92321e84e63d86c6c53a11f' 
  AND token = 'a6s2riDiOC2BaOgTzDgZSrj7Z/z87cnDUOoZk6Ii4hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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