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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3426537724798c8b966ef41e3dcf2534ae9335100e9f91751afcd7711b09ae77' 
  AND token = 'PQq91X41Gg94AFJ1us9565VOGcLoPY8tkYH4qPAEql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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