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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de9fef4353b443e713a3262060962172940b431438b4391d27f40a0607985e6' 
  AND token = '42NzrAbpwxfO/Ujg7jMMgH7tDFxGfxsU7d5cbSymYT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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