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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd2b229e6fa50243b0dc8a44a1d6a68d6da268cdfd34984754c3b4e67695e17' 
  AND token = 'GQm3hdZSpFsoRMoaEkUxxWUGu7dV5mlOmK3JSbm63cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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