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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca9268e0f237b986d84c799678a20a6ef4c65ea2201d13b6c92acb682968b5d' 
  AND token = 'znclJuKM4c6Q+JZpWACffChJ8M8WlFPjY2EMuHlmDog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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