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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f5c17ad56fde1cf57c9c4cdc0f54bcecb021d84ae0fad651886fdf8490d0f9' 
  AND token = 'g9JOpamaV0quU805B3IsclXSwOeVUyU1lf0LjeqSNAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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