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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8a28560fcb8051d6fb9969ac265517c3fb671bc421851a5bb26871d01f1c6e' 
  AND token = '+Br9vzt/3nQnBtYTP29xYZdIUxV74f81mK2Y7AtOqck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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