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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec742fc8bf831a2c1cc5bac05614f919ec059cf76acbd86d3d427c68d17b2c3' 
  AND token = 'KSRCz7xr+9KV+g/YlOT5iE6pe2elX96L7td08IkOsnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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