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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d16243cae9715d92741cd19190cdffd89fbe02931f84667677b526f845db18f' 
  AND token = 'RRB9f8ZA4ZUR6WDxCN80WnivlJeGHC2/UbcgSF8ihBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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