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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcb07aa8ba6748421ad4d56d539a242a6d3b36e7bc6eb6319e4d084c71b44ca' 
  AND token = '49k6HezwVHnDZzyo/46wZmHyYRtmIQf7iqAMJdGfnUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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