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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6989646b642e1385ef51e8ba8a1191d1f3af80f75a10231e178e6078af5673' 
  AND token = 'r5uzZiLWC6nhbzWG8fjukuAuXp+tv9Z9mdx1TIxfI1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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