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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bacc64c59f9cc3ded6f4992a0105c2fa47c2e53332184afbda9bd833304d962' 
  AND token = 'HUpa26oN5HMCUyvU/iEcfNYLpYO01Kn5Dc3RFxluBd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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