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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e69b3a4867f7335897d4846635706daaca5d2cccceed1dc714ff9484dd441fe' 
  AND token = '0sHKpQinA++/v2/E5u1QsoooofDQEdEGaujClRPUL5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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