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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fd6c8c801cb6a1d5ec808d97aec9a7a2f3c6e6545941f9bab844adfb361435' 
  AND token = 'S4lnVIJyeLkE+T+PHhkQBsFad6NC3kiZUKaC9J7grWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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