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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139c4cb4c129ed841698ddad8baf1f4c3580a0fa42202dd319d040cdd03dc612' 
  AND token = 'uiqytkRhdYiJXI1z9cdJZJvlBezjxB2XP2nkmxPpd0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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