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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909e9f7c854a0de844dfc74f02be6225887a95659f92170ba8d3badc568bf490' 
  AND token = 'hVBsFer9AD9qtzd9+1+nrXblokxqhzrjl8i6OPtGlfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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