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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca5b879bb73be2e2fcfc5aef712f1dd87466af641fc59a14b0b0e63934071e2' 
  AND token = 'ppqov4+HfQ6BXG72oXbCJHnW39En0VKIi3mj4RQJkG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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