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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166e524c79aac81c7a741317daac19b1a6f4db9a4a81b2d1f67b4f183d81cee0' 
  AND token = 'RU46PIq82yaEwBoMC/uCoVxH/w8h+I572BZxCJ19oV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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