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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac04ebf20d741416350eeba0fd70e9e856618dcf837f1112e96e4d035fd8069' 
  AND token = 'FCWPyl8zrtEC0nz4mTihroKdM6YIgsA99Vz+tsV5BQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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