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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eff4b1a60bbd79f7c86130f54a839eac7d701b3728bdf43095ba308865e8096' 
  AND token = 'EoGl5WaVoQ4jhw11+yaYleONdTz2S8k7n68UeWBsjv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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