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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec76ca4803c29f25d72389eeda0ddf60f2b4fbc0ded5ef3e9debc7814d66fe7' 
  AND token = 'QgJHdBx/HrE4eNfw18uVjXLB9k0L20A48C75acsvYN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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