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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a32b22e3a686ab41d19fee4d06584b8486d8551a29bcc665898a0a784a3a3f' 
  AND token = 'LuF1iwpXNXuCX+Ieiq/QcIb65oeOCHhmMkwNll0+ijo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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