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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cadbb631ed954fb2929b003246629da74f4e36acdcb397ac79f738ee3570212' 
  AND token = 'Ob911w+tpAHDnD3zkC9BquQSMRpB4F4ZOYl5BFx49Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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