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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9796f63b419e5b1b24aff6a2daaf71e02045014f0c8ea78f03b5221a1e3ef9' 
  AND token = 'HQ25awnm/hNoaLeP8Q4u31VRJ1osXkwwr2ax1DUI0y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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