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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36793a237aea31076345ae798a7b33f07aa716a6fef6f75e89975f4d7a57e7e1' 
  AND token = 'bF0JrpMq5BRaqL1rKO0xcptUie6lkIM7PfzbPb9ELAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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