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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbbe8ae5995e15c27f57deb9b334478c4d8a33f8889df0d1f3974d4921536f9' 
  AND token = 'gCqd78hsMQlJ29PSfaLEAc43Pjd3h0iqu5zUVU9MelM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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