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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037faeaf33c4b73700d538a66d78bbb86bb6bf31198976d54fc69a7768a5250a' 
  AND token = 'cTvQEXJclje9T1l9mC9FGjRFnFFHxuM8JRafiLV52aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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