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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3151cb4eb2e163f1799f63a1dcec44853f9c41d2543447d0a39bb98d2899ad7' 
  AND token = 'Jd8XFvfebTQW4XOWhyaIsphwynw2NLP6Y8uYoaWA0Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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