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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bf01a990ddf4da14cb2b7edd8a6b5f576b03c10fce3cb992d08f6878eaecab' 
  AND token = 'VC5rzZ+x5DF18I9JjLjs9Q7Lh4PZi2hCd7/JawO/x5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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