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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde6e128cd392336e1d867b7e022b18f8a3db6c379306272fd75d353cafccc36' 
  AND token = 'ME+Boy8UpVlsdMXThm9DR4K1Si0XGXyDTUFKh6mTn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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