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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e232cdfbc76b73af1d1b7e909efa863cd28c8d365679a76070b74b375a8854' 
  AND token = '25p4L6337zmV6ta8c1ftFgM2EaQs00z2oWDsYu7rfmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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