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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde9cf5ea47e732bffe3c28825bf0dab429cd9347babf7970f6f9c8401853273' 
  AND token = 'qeerxH96WB+AGhm481Yv04sgs1AccnM02Pbw3Mm2hwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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