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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25c3680fb2b18d690dc34e0d6bb0c07d151f80492d4b4e3d98f7f8067fc90fd' 
  AND token = 'VUggn8mbSDQJ42vS5TLfPzHJ6XMigUZz8mgmi+M8ais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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