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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96e92197e1317367efba484aa0972dfdb471aa0ff083c2498b94b7f9d1e8e67' 
  AND token = 'KbSZVankkThixeTJ1LJAFO9xS2/3Zl0vLp0xXzpmiTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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